Crank-shaft transmission-pulley



1. w. B. LADD AND R. E. RICH CRANK SHAFT TRANSMlSSION PULLEY.

APPLICATlON FILED APR-2|. 1919.

1,341,914. Patented June l, 1920.

' pu y end of the crank-shaft by a transverse pin,

UNITED STATES,

"P T NT OFFIC JOHN w. is. LADD AND RALP Eamon, oFoIIIcAeo, IL LIIIoIs.

' Application filed'April 21,

Heretofore the crank-shaft of internal;

combustion engines of automobiles projected forward beyond its'be'arings in-the-heads of the casing but a very short distance and hada fan-pulley thereon the rear of which was closed and was removed such a'short distance that there was not-space enough on the said shaft between the boss of the and its bearings for g a gear or sprocket to be mounted thereon for driving any equipment which the owner of the automobile might desire to install; This fan pulley was secured to the forward extended which was inserted through its hub and through a-transaxial opening in said shaft,

and, as it would be both awkward and costly to drillnew holes in the said forwardly extending end thereof, said transaxial opening and said pin must be utilized to secure any' improved substitute pulley that may be devised to provide the necessary-space between the pulley and the adjacent head of the engine, for the mounting of a gear or sprocket on said shaft pulley boss. In the absence of a self starter the engine is started by pushing rearwardly on and turning the hand-crank projecting out beyond the front of the automobile and causing a clutch-head on-the rear end'of the startershaft to enter the open front side ofthe pulley and engage theend portions of the pin projecting beyond the boss of said pulley. In view of this fact,-the web cannot be-moved forward, as it would then inter-- fere withthe clutch head engaging the pin, and the pin cannot be moved without drilling a new hole in the engine-crankshaft which besides weakening the shaft is impracticable for the reasons heretofore stated. I I e a The objects of our invention are to provide-asubstitutepulley which is so con Specification of Lettersi atent.

CRANK-SHAFT TRANSMISSION-PULLEY.

1919. Serial Nb. 291,635.

structed as to make it possible to move the pulley forward on the crank-shaft with- Patented June 1, 1920.

out changing the position'of the pin connecting the original pulley to the shaft; to cont nue to engage-the pin with the axially allnmg clutch head, of the starter 7 shaft,

forithe introduction of a gear or sprocket or other power transmission device for op erating an. air pump, or water. pump or other equipment desired by the owner of the automobile and toprotect the pulley-belt from said gear or sprocket. These objects we accomplish by the means hereinafter gthe same as heretofore; -to provide space fully described, and as'particularly pointed out in the claims.

In the drawings: v

Figure 1 is a view looking at the front end of the crankshaft of the engine showing our. improved pulley. mounted thereon.

Fig. 2 is a longitudinal central section on line 2, 2 of Fig. 1 thereof showing a frag ment of the crank casings.

Fig. 3 is a View similarto Fig. 2 showing the said pulley engaged by the clutch-head of the hand-crank shaft,

Fig4 is a cross-section ofsaid pulley taken on dotted line Jr-4, Fig.1. 1

Referring to the drawings, 5 represents the broken away forward'end of the casing of an internal combustion engine, and 5 the projecting forward end of the crankshaft journaled therein. Our improved pulley, consisting'ofa cylindrical bossv 6, rear extension thereof 7, spokes 8,8, and rim9, is securely mounted on said shaft. Rim 9 is concentric to boss 6 and is connected thereto by four spokes 8, which latter, preferably, extend tangentially from the boss and are triangular or other shape in crosssection.

The pulley is of crank-shaft .5 by means of a transverse pin '12, which extends through the 'same transversehole in the end of the shaft that was originally made to receive the pin that fastened theoriginal pulley, that was on said shaft when the automobile came out of the factory. The ends of this pin, preferably, extend to the inner circumference of the rim,'and are designed tobe engagedby the teeth or other projections onthe adjacent end of. the clutch-head 10 of. the starter shaft when it is desired to start the'engine; The spokes 8, 8, are disposed in the same transverse plane as said pin, and may be secured to theforward end made of any shape inecross-section that {vill alloiv the clutch-head toengage With, the

pin, the spokes and pin, or the spokes. We prefer, however, to have the clutch-head, engage the ends of the pin and toishape' the spokes triangular in cross-section, and to locate the holes in the boss of the pulley sotha-t the ends of said pin-will bebacked up by the fiat side edges of said spoke, although this isv not absolutely necessary.

When, however, the spokes are relied upon,

' to reinforce theends' of the'pin, two :oppositely disposed triangular spokes-are niazde narrower so as to alford' the-necessary clear an-ce'for the pint. l

The periphery of rim "9 inclinesslightl'y from its centerof Widtht'o rits side iedges and the rear edge thereof is provided"with an outwardly projecting, circumferential flange 13,Which "absolutely prevents belt 4,

from slipping to the-rear;

a The rear extension 7 'of the :boss, immediately back of the spokes, is, f preferably,

of greater diameter than that of the forward cylinder, hereinbefore described, and the rear end of said extension-is rabbted, a's'at 15,-to providefa seat foragear or sprocket 1,6 that'drives some piece of mechanism such as airepnmp', 1 Waterpump or self-starter (.not'shown). This ra'bbetl5 is such a dis: tance from the pulley that; when locked in i its seat it cannot interfere with .thevSame. The gear or sprocket lfiimaybe cast infone piecewith the. pulley 'ELHClfitS bdSS, hereinbefore described, but wewprefer to 'm'ake'themseparate and assemble them,-substantially as shown. The casting of. the" pulley in one 1 piece of metal the inserting of pin 12in of gear 16; on rear extension? involves no more labor thanheretofore required to as-' semble the similar unimproved parts ofthe I old-style pulley and the additional cost'of the material emzployed making-my improved pulley is, comparativcly speaking,- nothing, considering the advantages "ob-v;

tained. r I e 1 -Wh'at'we cl'aim asnew. is:

1. In raidevice of-the class described combination of a shaft having a transverse hole therein located a'ipredete-rmined -d istancefromth'e end of said shafn-a pulley comprising a boss-haying diametrically opposite holes therein, a concentric rim','ispokes connecting said "boss and rim, 4a .pinpassing through the holes in the boss an dishaft and extending toward the rim int-he same plane assaid spokes, and aigear connected tosaid pulley.

I2, device'of the-'class -'described the combmation of a shafthaving a'transv'erse hole therein located a predetermined distance -'from the end thereof, a pulley comprising fa *boss 'having" sdiametnieailly cipposite holes therein, a concentric rim,

7 connecting said boss and rim, a pin passing through the holes in the boss and shaft and extending tmvardthe rim to the same plane as said spokes, said boss extending to the rear of the plane" of the rear edge of the rim, and a gear connected to said rear ex tcnsio'no'f theboss. V ,8. .In,adeyiceofthe class described the combination of a shaft having a transverse a r 4c. In a deyice of the class the combination of a shaft v having a transverse hole therein located a predetermined fdistance from theend-thereof, of apulley of the kind specified comprising a'boss having arearward 'eXtens1on-,a rim concentric there- 1 to, spokes connecting said rim -an.d -bossthat are triangular in cross-section, a transverse pin that passes through'the hole-1n sa d.

shaft andfboss in the same fpl-ane; as the spokes and has its endsfiextending beyond said "boss toward said -rin r, ,and a f g-ear mounted 1 on, and supported upon-sardrear- Ward QXUGIISIQIL; I

f 5.; In devicefof theclass described hole therein located predetermineddistance from said head, of a pulley of the kind specified compr sing ;a boss having a. rearward extension, a rim?concentricthert'othe V rear edge of the periphery of wh ch has an;

outwardly projecting circumferential flange, spokes that are triangular ngcrosssect on 10c coinbinationof a shaft liaving,a;transi er se' connecting said boss ;-a{nd. rim, a transverse,

pin passing diametrically through the: hole; in said shaft and said boss in the sameplane as said spokes andhaving its ends extending beyond said boss toward saidrim, and-anintegral gear spaced-apart fromsaidrearward 1 extension. v

, 6 Ina device of the the I combination of a shaft havingwa transverse hole therein located .a predetermined 7 distance from the; end thereof,of.a pulley of the kind specified comprising a :boss having a rearward extension, the rear of 'Whichvis rabb'eted.cincu'mferentially, ,a trim zconcen- V tric 'th'eret'olthe rear --,edge of which. has an outwardly projecting circumferential flange, spokes projecting from said boss and-con- .necting saidrim thereto,--a transversejwp'in passing diametrically --tlrrough the hole in said shaft and said boss Whoseends extend toward the rimin-thewsame plane asssaid spokeszand are adapted to secure the same to nearer;:

the shaft, and a gear spaced apart from and seated and secured in the rabbeted end of said rearward extension.

7 In a device of the class described the combination of a shaft having. a transverse hole therein located a predetermined distance from the end thereof, of a pulley of the kind specified comprising a boss having a rearward extension, a rim concentric thereto the rear edge of the periphery of which has an outwardlyprojecting circumferential flange, spokes that are triangular in cross-section projecting from said boss and connecting said rim thereto, a transverse pin passing diametrically through the hole in said shaft and said boss in the same plane as said spokes and having its ends extended beyond said boss and bearing against the widest edges of two oppositely disposed spokes, and a gear spaced apart from said rim and secured to said rearward extension.

8. In a device of the class described the combination of a shaft having a transverse hole therein located a predetermined distance from the end thereof, of a pulley of the kind specified comprising a boss having a rearwardly extension whose rear end is rabbeted circumferentially, a rim concentric thereto the rear edge of which has an outwardly projecting circumferential flange, spokes that are triangular in cross-section projecting from said boss and connecting said rim thereto, a transverse pin passing diametrically through the hole in said shaft and through said boss in the same plane as the spokes and having its ends extended beyond said boss and bearing against the widest edges of two oppositely disposed spokes, and a gear or sprocket spaced apart from and secured to said rearward extension.

9. In a device of the class described the combination of a shaft having a transverse hole therein located a predetermined distance from the end thereof, of a pulley of the kind specified comprising a boss having a rearward extension the rear end of which is circumferentially rabbeted, a rim concentric thereto the rear edge of the periphery of which has an outwardly projecting circumferentialflange, spokes that are triangular in cross-section and project tangentially from said boss and connecting said rim thereto; two diametrically opposite spokes being narrower than the rest, a transverse pin that passes diametrically through the hole in said shaft and said boss in the transverse plane of the spokes and having its ends extended beyond said boss toward said rim and bearing against the wider edges of the said narrower spokes, and a gear spaced apart from said rim and secured and seated in the rabbeted end of said extension.

10. In a device of the class described the combination of a crank shaft having a transverse hole located at a predetermined point in the end thereof, a pulley and a gear alongside of said pulley and made integral therewith, a boss for said pulley, spokes connecting said boss and'the rim of the pulley, and a pin extending through said spokes and through said transverse hole and having its ends extending through said boss toward said rim.

11. In a device of the class described the combination of a crank-shaft having a transverse hole located atv a predetermined point in the end thereof, of a combined pulley and gear, the former including a rim, spokes and boss, and a pin passing through said boss and said transverse hole in the plane of said spokes and having its ends extending beyond said boss toward said rim.

In witness whereof we have hereunto set our hands this 31st day of March, 1919.

JOHN W. B. LADD. RALPH E. RICH. Witnesses:

MARION BOLTE,

ARCH. N. CAMPBELL. 

